My Sister's Ex-boyfriend

Kim Taehyung: ki'm tae'hyung
Meaning: home breaker.
If his name could be put in the dictionary that is how it should have been. He was hot alright. Totally breathtaking. No one could deny it. Except for you. It was a sin in your eyes to even make contact with any one of your sister's boyfriends to even say ex boyfriends. You would never have seen it coming. As he walked through the door of your humble home, he becomes a part of your complicated life where he starts becoming the main character in your catastrophe. It seemed like your world evolved around him now.
You were going to become a sinner. Which comes first? Blood ties or your growing undying love for your sister's ex-boyfriend.
Just 3 words would crumble your world to dust